Hi Carsten,
The task has a minimum of Re(Z)=0.2 at c1=0 independent of L1. It is confirmed by plotting the analythical result. However computing with real(Z) form simulations a totally different (noisy) plot is obtained. It is not a QucsStudio issue: the same results arise from Octave and Matlab as well. The oscillating optimization results may also have the same origin.
Any idea?
